Abstract:

The present invention provides a power converter mounting system including
a flange that cooperates with a power converter and an enclosure. The
flange includes a through hole that cooperates with an opening in the
enclosure to permit the power converter to extend therethrough. A number
of fasteners connect to the flange and overhang a portion of the power
converter. The fasteners are configured to be manipulated from a front
side of the power converter. An outer perimeter of the flange extends
beyond the opening in the enclosure. The flange is secured to the
enclosure with a number of fasteners that are also operable from the
front side of the power converter. The power converter mounting assembly
is configured to secure a power converter to an enclosure so as to
satisfy a variety of sealing requirements as well as allowing convenient
servicing of the power converter system.

Claims:

1. A mounting assembly for a power converter having a housing with outer
sidewalls and a lip extending outwardly from at least a portion of the
outer sidewalls, the mounting assembly comprising:a generally planar
flange having:a front and a rear surface and an opening configured to
allow passage of the sidewalls of the converter therethrough;the front
surface of the flange having a mating surface extending substantially
around the opening to receive a rear face of the lip of the power
converter;the rear surface of the flange configured to engage a generally
planar mounting surface; anda plurality of fastener openings displaced
from the mating surface to clear the lip of the power converter when the
lip is positioned against the mating surface;a sealing member fitting
between the mating surface of the flange and the rear face of the lip;
anda plurality of fastening members, each fastening member engaging one
of the fastener openings from the front surface of the flange and having
an edge engaging a front face of the lip when the lip is positioned
against the mating surface to sealingly compress the sealing member
between the mating surface and the rear face of the lip.

2. The mounting assembly of claim 1 wherein each fastening member engages
a cavity in the housing of the power converter.

3. The mounting assembly of claim 2 wherein:the lip extends generally
around the outer periphery of the power converter; andthe mating surface
of the flange is recessed below the front surface such that the front
face of the lip is generally coplanar to the front surface of the flange
when the lip is positioned against the mating surface with the sealing
member positioned therebetween.

4. The mounting assembly of claim 1 wherein the sealing member is an
o-ring.

5. The mounting assembly of claim 1 further comprising:a ridge on the
flange extending away from the front surface and around at least a
portion of the flange;a cover for the power converter having a front
surface, a plurality of side surfaces, and a rim extending generally
outward from a bottom edge of at least a portion of the side surfaces;
anda second sealing member engaging the ridge and fitting between the rim
and the front surface of the flange.

6. The mounting assembly of claim 5 wherein the cover has an opening in
one of the side surfaces at one end the converter, the mounting assembly
further comprising:a conduit plate sized to fit the opening in the cover
and removably connected to the front surface of the flange; anda third
sealing member fitting between the conduit plate and the front surface of
the flange, a portion of the third sealing member extending beyond each
side of the conduit plate and under the cover adjacent to the conduit
plate.

7. The mounting assembly of claim 1 wherein the mounting surface is the
inner surface of an industrial enclosure.

8. A method of mounting a power converter to an enclosure comprising the
steps of:attaching a flange to an inner surface of the enclosure with one
or more first fasteners operable from the interior of the enclosure;
andsecuring the power converter to the flange with one or more second
fasteners operable from the interior of the enclosure.

9. The method of claim 8 wherein the step of securing the power converter
further comprises the steps of:attaching the second fasteners to a front
surface of the flange;positioning a sealing member between a mating
surface of the flange and a lip of the power converter;inserting the
power converter through an opening extending through the flange;
andattaching the second fasteners to the power converter.

10. The method of claim 8 further comprising the steps of:positioning a
second sealing member around at least a portion of the front surface of
the flange;positioning a third sealing member on the front surface of the
flange and generally along one end of the flange wherein the combination
of the second and third sealing members extend substantially around the
front surface of the flange;attaching a cover for the power converter to
the front surface of the flange wherein the second sealing member and at
least a portion of the third sealing member are positioned between a rim
of the cover and the flange; andattaching a conduit plate to the front
surface of the flange along the end of the flange having the third
sealing member wherein the third sealing member is positioned between the
conduit plate and the flange.

11. The method of claim 10 wherein the cover, the conduit plate, the
second sealing member, and the third sealing member work together to
satisfy one of UL type 12, IP5X, and NEMA type 12 sealing requirements
for the converter.

12. A mounting assembly for a power converter having a housing with outer
sidewalls and a lip extending outwardly from at least a portion of the
outer sidewalls, the mounting assembly comprising:an enclosure having a
plurality of sides, a rear surface, a front surface, an access opening
extending through at least a portion of the front surface, and a mounting
opening extending through at least a portion of the rear surface;an
access panel removably covering the opening in the front surface of the
enclosure;a generally planar flange positioned on the rear surface of the
enclosure having:a front surface, a rear surface, and an opening
configured to allow passage of the sidewalls of the converter
therethrough wherein the flange is positioned on the rear surface of the
enclosure such that the opening in the rear surface and the opening in
the flange are generally aligned;the front surface of the flange having a
mating surface extending substantially around the opening to receive a
rear face of the lip of the power converter;the rear surface of the
flange configured to engage a generally planar mounting surface;a
plurality of first fastener openings displaced from an outer edge of the
flange; anda plurality of second fastener openings displaced from the
mating surface to clear the lip of the power converter when the lip is
positioned against the mating surface;a sealing member fitting between
the mating surface of the flange and the rear face of the lip; anda
plurality of first fastening members, each first fastening member
engaging one of the first fastener openings from the front surface of the
flange to connect the flange to the rear surface of the enclosure;a
plurality of second fastening members, each second fastening member
engaging one of the second fastener openings from the front surface of
the flange and having an edge engaging a front face of the lip when the
lip is positioned against the mating surface to sealingly compress the
sealing member between the mating surface and the rear face of the lip.

13. The mounting assembly of claim 12 wherein the plurality of second
fastening members may be disengaged from the power converter such that
the power converter may be removed from the enclosure without disengaging
the first fastening members.

14. The mounting assembly of claim 12 further comprising:a ridge on the
flange extending away from the front surface and around at least a
portion of the flange;a cover for the power converter having a front
surface, a plurality of side surfaces, and a rim extending generally
outward from a bottom edge of at least a portion of the side surfaces;
anda second sealing member engaging the ridge and fitting between the rim
and the front surface of the flange.

15. The mounting assembly of claim 14 wherein the cover has an opening in
one of the side surfaces at one end the converter, the mounting assembly
further comprising:a conduit plate sized to fit the opening in the cover
and removably connected to the front surface of the flange; anda third
sealing member fitting between the conduit plate and the front surface of
the flange, a portion of the third sealing member extending beyond each
side of the conduit plate and under the cover adjacent to the conduit
plate.

Description:

[0001]This application claims the benefit of U.S. Provisional Application
No. 61/112,321. The provisional application, entitled "Powered Equipment
Drive Mounting Assembly," was filed on Nov. 7, 2008 and is hereby
incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

[0002]The present invention is directed to power converters, for example
motor drives, used to convert electrical energy from one form to another.
More specifically, the present invention provides a method and apparatus
for mounting the power converter.

[0003]As is known to those skilled in the art, power converters, such as
motor drives, are commonly mounted within an industrial enclosure.
Industrial enclosures may be configured according to many specifications
such as those established by the National Electrical Manufacturers
Association (NEMA), the Underwriters Laboratories (UL), or the
International Electrotechnical Commission (IEC). These classifications
define a series of increasing levels of protection that the enclosures
must provide to personnel working around the enclosure or to the
equipment contained within the enclosure. NEMA type 4 enclosures, for
example, require the enclosure to be constructed for either indoor or
outdoor use and to provide a degree of protection to personnel against
access to hazardous parts, to provide a degree of protection of the
equipment inside the enclosure against ingress of dust or water, and that
will be undamaged by the external formation of ice on the enclosure. NEMA
type 4X enclosures further require a level of protection against
corrosion.

[0004]The environments in which the power converter and enclosure are
installed typically dictate the level of protection required. The
enclosures are often purchased according to the desired level of
protection. The enclosures may be made of different materials, utilize
different closing members, or different sealing members according to the
specified level of protection. In most instances, a power converter may
be mounted entirely inside the enclosure, thereby maintaining the
original level of protection for which the enclosure was designed.
Optionally, a power converter may need to extend outside the enclosure.
For example, due to the size of the converter or due to cooling
requirements, a heat sink connected to the power converter may extend
through one surface of the enclosure. In order for the enclosure to
retain its rated level of protection, the hole through which the power
converter extends must be sealed to meet the same level of protection as
required by the enclosure.

[0005]In the past, many converters configured for such an application
included a flange integrally formed with the converter housing or
provided an add-on flange that sealingly cooperated with the converter
and the surrounding enclosure. However, providing a converter with an
integral flange increases the cost associated with such converters.
Further, different housings must be manufactured and supplied for each
converter according to the environment in which it is to be installed.

[0006]Providing an add-on flange has also typically incurred various
disadvantages. Existing add-on flanges have commonly been secured to the
converter and the enclosure in such a manner that the converter can no
longer be removed from the enclosure independently of the flange. Such an
arrangement complicates the efforts associated with servicing the
respective converters. Furthermore, removing the flange to service the
converter increases the potential for leaks to form between the converter
and the flange when the flange is reinstalled in the enclosure. Such
flanges are susceptible to overly complicated mounting and integration
assemblies, poor or inadequate sealing, assembly prior to installation of
the converter, and cost increases with respect to base model assemblies.

[0007]Therefore, there is a need to provide a converter mounting assembly
that can provide a generally sealed mounting of the converter in
accordance with different enclosure specifications, for example, NEMA
Type 4/4X, NEMA Type 12, UL Type 12, IP5X, and IP6X applications. The
mounting assembly can provide multiple mounting protocols, is simple to
integrate with existing product platforms, and minimally affects the cost
associated with providing a converter useable in a variety of other types
of applications.

BRIEF DESCRIPTION OF THE INVENTION

[0008]The present invention provides a power converter mounting system
including a flange that cooperates with a power converter and an
enclosure. The flange includes a through hole that cooperates with an
opening in the enclosure to permit the power converter to extend
therethrough. A number of fasteners connect to the flange and overhang a
portion of the power converter. The fasteners are configured to be
manipulated from a front side of the power converter. An outer perimeter
of the flange extends beyond the opening in the enclosure. The flange is
secured to the enclosure with a number of fasteners that are also
operable from the front side of the power converter. The power converter
mounting assembly is configured to secure a power converter to an
enclosure so as to satisfy a variety of sealing requirements as well as
allowing convenient servicing of the power converter system.

[0009]In one embodiment of the invention, a mounting assembly for a power
converter having a housing with outer sidewalls and a lip extending
outwardly from at least a portion of the outer sidewalls is disclosed.
The mounting assembly includes a generally planar flange having a front
surface, a rear surface, and an opening. The opening is configured to
allow passage of the sidewalls of the converter therethrough. The front
surface of the flange has a mating surface extending substantially around
the opening to receive a rear face of the lip of the power converter, and
the rear surface of the flange is configured to engage a generally planar
mounting surface. The flange further includes multiple fastener openings
displaced from the mating surface to clear the lip of the power converter
when the lip is positioned against the mating surface. The mounting
assembly further includes a sealing member fitting between the mating
surface of the flange and the rear face of the lip and multiple fastening
members, each fastening member engaging one of the fastening openings
from the front surface of the flange and having an edge engaging a front
face of the lip when the lip is positioned against the mating surface to
sealingly compress the sealing member between the mating surface and the
rear face of the lip.

[0010]Thus, it is a feature of this invention to provide a flange and
sealing member to mount a power converter in an industrial enclosure
where a portion of the converter may extend through the enclosure. The
sealing member provides a degree of protection against the ingress of
dust or water. Additionally, the converter may be inserted through the
flange and fastened to the flange from the same side of the flange,
providing easy installation and/or replacement of the power converter.

[0011]As still another aspect of the invention, the lip extends generally
around an outer periphery of the power converter, and the mating surface
of the flange is recessed below the front surface such that the front
face of the lip is generally coplanar to the front surface of the flange
when the lip is positioned against the mating surface with the sealing
member positioned therebetween. The sealing member may be an o-ring.

[0012]Thus, it is another feature of this invention, that the sealing
member may be positioned on the power converter prior to inserting the
power converter through the opening of the flange. The drive may then be
inserted through the flange and the sealing member sits between the
flange and the drive, providing a seal around the entire drive.

[0013]As yet another aspect of the invention, a ridge on the flange
extends away from the front surface and around at least a portion of the
flange. The mounting assembly also includes a cover for the power
converter having a front surface, a plurality of side surfaces, and a rim
extending generally outward from a bottom edge of at least a portion of
the side surfaces. A second sealing member engages the ridge and fits
between the rim and the front surface of the flange. The cover has an
opening in one of the side surfaces at one end of the converter, and a
conduit plate is sized to fit the opening in the cover and removably
connected to the front surface of the flange. A third sealing member fits
between the conduit plate and the front surface of the flange. A portion
of the third sealing member extends beyond each end of the conduit plate
and under the cover adjacent to the conduit plate

[0014]Thus, it is a feature of this invention that a cover providing
additional protection may be mounted over the power converter, securing a
second sealing member between the cover and the flange. The conduit plate
positioned in the opening at the end of the cover permits the cover to be
connected to or removed from the power converter as needed without
disconnecting the electrical connections to the power converter which
pass through the conduit plate. The third sealing member, in cooperation
with the second sealing member, provides a seal between the cover/conduit
plate and the flange which extends around the drive.

[0015]These and other advantages and features of the invention will become
apparent to those skilled in the art from the detailed description and
the accompanying drawings. It should be understood, however, that the
detailed description and accompanying drawings, while indicating
preferred embodiments of the present invention, are given by way of
illustration and not of limitation. Many changes and modifications may be
made within the scope of the present invention without departing from the
spirit thereof, and the invention includes all such modifications.

BRIEF DESCRIPTION OF THE DRAWINGS

[0016]Various exemplary embodiments of the subject matter disclosed herein
are illustrated in the accompanying drawings in which like reference
numerals represent like parts throughout, and in which:

[0017]FIG. 1 is a isometric view of an exemplary power converter mounted
to an industrial enclosure using a mounting assembly according to one
embodiment of the present invention;

[0018]FIG. 2 is a front elevation view of the power converter and
industrial enclosure of FIG. 1;

[0019]FIG. 3 is a top plan view of the power converter and industrial
enclosure of FIG. 1;

[0020]FIG. 4 is an isometric view of an exemplary power converter and a
flange according to the present invention;

[0021]FIG. 5 is an exploded view of the power converter and flange of FIG.
4;

[0022]FIG. 6 is a partial isometric view of FIG. 4 illustrating an
exemplary fastener securing the power converter to the flange;

[0025]FIG. 9 is an isometric view of an exemplary power converter with a
type 12 cover connected to the flange;

[0026]FIG. 10 is a partial cross-sectional view taken at the point shown
in FIG. 9; and

[0027]FIG. 11 is a partial cross-sectional view taken at the point shown
in FIG. 9.

[0028]In describing the various embodiments of the invention which are
illustrated in the drawings, specific terminology will be resorted to for
the sake of clarity. However, it is not intended that the invention be
limited to the specific terms so selected and it is understood that each
specific term includes all technical equivalents which operate in a
similar manner to accomplish a similar purpose. For example, the word
"connected," "attached," or terms similar thereto are often used. They
are not limited to direct connection but include connection through other
elements where such connection is recognized as being equivalent by those
skilled in the art.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029]One embodiment of the present invention is a power converter
mounting system including a flange that cooperates with a power converter
and an enclosure. The flange includes a through hole that cooperates with
an opening in the enclosure to permit the power converter to extend
therethrough. A number of fasteners connect to the flange and overhang a
portion of the power converter. The fasteners are configured to be
operable from the front side of the flange. An outer perimeter of the
flange extends beyond the opening in the enclosure. The flange is secured
to the enclosure with a number of fasteners that are also operable from
the front side of the flange. The power converter mounting assembly is
configured to secure a power converter to an enclosure so as to satisfy a
variety of sealing requirements as well as allowing convenient servicing
of the power converter system.

[0030]Turning initially to FIGS. 1-3, an exemplary power converter 20 is
mounted to an industrial enclosure 15 using a mounting assembly 10
according to one embodiment of the present invention to provide a seal
between the power converter 20 and the enclosure 15. The enclosure 15 has
a plurality of sides 16, a back surface 17, and a front surface 18. An
access panel 19 is typically connected to the front surface 18 to
alternately cover an opening 21 in the front surface 18 and provide
access to the interior of the enclosure 15. The access panel 19 may be of
any type known in the art such as a hinged or sliding door or a panel
that is removably fastened to the front surface 18, for example by screws
or clips. Optionally, a sealing member, such as a gasket, for the
enclosure 15 may be provided around the perimeter of the opening 21 to
meet the requirements for protecting the interior of the cavity according
to the enclosure specifications, such as NEMA, UL, or IEC requirements.

[0031]As further seen in FIGS. 1-3, a power converter 20 may be mounted in
the enclosure 15 such that a portion of the converter 20 extends through
an opening 22, which is typically cut in the back surface 17, according
to the mounting location of the converter 20. A flange 30 is first
positioned such that an opening 32 in the flange aligns with the opening
22 in the back surface 17. The flange 30 is secured to the back surface
17 by appropriate first fastening members 48, for example, screws or
bolts. The first fastening members 48 are preferably operable such that
the flange 30 may be secured to or released from the back surface 17 from
the front surface 38 of the flange 30, that is from within the enclosure
15 as illustrated in FIGS. 1-3. A portion of the converter 20, for
example the heat sink and fan assemblies, may then be passed through the
openings 32 and 22 in the flange 30 and in the back surface 17,
respectively. Second fastening members 50 secure the converter 20 to the
flange 30. Preferably, the second fastening members 50 are clips that may
also be secured to the flange 30 from within the enclosure 15. Thus, both
the first 48 and the second 50 fastening members may be manipulated from
the same side of the flange 30 and, preferably, from a front surface 38
of the flange 30 facing into the enclosure 15.

[0032]Referring next to FIGS. 4-8, the sealing engagement between the
flange 30 and the converter 20 is illustrated. The flange 30 is generally
planar and includes a front surface 38, a rear surface, and an interior
opening 32 that is similar in size to a base 24 of the converter 20. The
front surface 38 of the flange 30 has a mating surface 34 extending
around the periphery of the interior opening 32 to receive a rear surface
of the lip 28 of the converter 20. First fastener openings, displaced
from the mating surface 34 far enough to clear the lip 28 of the
converter 20 when the converter 20 is positioned against the flange 30,
extend around the front surface 38 of the flange 30. Second fastener
openings 37, displaced from the outer edge 36 of the flange 30, extend
through and are spaced around each side of the flange 30 for securing the
flange 30 to a mounting surface 25. A portion of each opening 37 may be
threaded to receive a first fastening member 48, such as a screw or a
bolt. Optionally, the inner surface of the opening 37 may be smooth
permitting a fastening member 48 to pass through the opening 37 and
engage a threaded opening in the mounting surface 25. The flange 30 may
be formed of any suitable material known to one skilled in the art and is
preferably formed of a material that is sufficiently pliable to support a
sealed interaction between adjacent structures and rigid enough to
cooperate with and support such structures. For example, the flange 30
could be formed from a composite material, such as plastic, or rubber
over a metal or an otherwise more rigid and robust material.

[0033]The converter 20 is secured to the flange 30 by fastening members
50. The fastening members 50 preferably include a screw 52, a washer 54,
and a clip 56. Each clip 56 includes a first portion 53 and a second
portion 57. The first portion 53 generally overlies the flange 30 and
includes a hole 55 extending generally through the center of the first
portion 53. The second portion 57 extends away from the hole 55 and is
configured to engage the converter 20 by extending into a cavity 42 along
the outer surface of the converter 20. As shown in FIGS. 6 and 8, the
screw 52 passes through the washer 54 and the hole 55 into a threaded
portion 35 of the flange 30. The screw 52 may be secured to the threaded
portion 35 of the flange 30 from the outer surface of the flange 30.
Optionally, any suitable fastening means for securing the converter 20 to
the flange 30, which is operable from the outer surface 38 of the flange
30, may be used.

[0034]Referring to FIG. 5, a lip 28 extends around the periphery of the
converter 20. The rear face of the lip 28 is configured to engage the
mating surface 34 of the flange 30. The mating surface 34 is preferably
recessed below the outer surface 38 of the flange 30, forming a lip
around the opening 32 in the flange 30 such that the front face of the
lip 28 is generally even with the outer surface 38 of the flange when the
converter 20 is secured to the flange 30. Preferably, a sealing member
40, such as an O-ring, is disposed between the flange 30 and the lip 28
of the converter 20.

[0035]In another embodiment, a cover 60 may be required as a further seal
over the converter 20, as seen in FIGS. 9-11. The cover 60 includes a rim
62 which extends around a portion of the cover 60, and preferably
generally around three sides of the cover 60. The rim 62 extends beyond
the outer edge 36 of the flange 30. A second sealing member 44 is
preferably positioned between the rim 62 of the cover 60 and the front
surface 38 of the flange 30. The flange 30 includes a ridge 39 which
extends outward from the front surface 38 to engage the second sealing
member 44. The ridge 39 preferably extends generally around three sides
of the flange 30 to align with the rim 62 of the cover. A series of holes
66 extend through the rim 62 of the cover 60 and align with a series of
openings 37 in the flange 30. A fastener, not shown, such as a screw is
passed through each of the holes 66 in the cover 60 and into the
corresponding openings 37 in the flange 30. Preferably, the openings 37
in the flange include a threaded portion into which a screw may engage to
secure the cover 60 to the flange. Optionally, the threaded portion may
extend over a portion of or for the entire depth of the opening 37. The
opening 37 may extend partially or entirely through the flange 30.
Optionally, any other suitable means of securing the cover 60 to the
flange 30 may be used such that the rim of the cover 60 engages a first
side of the sealing member 44 and that an opposite side of the sealing
member 44 engages the flange 30 and, preferably, the ridge 39 on the
flange 30.

[0036]The cover 60 further includes an opening 64 at one end. A conduit
plate 70 is included having an outer periphery 72 which fits the opening
64 in the cover 60. A third sealing member 80 may be provided that is
generally positioned between the conduit plate 70 and the flange 30. The
third sealing member 80 preferably extends along the flange 30 beyond
each side of the conduit plate 70 such that the each end of the third
sealing member 80 is positioned between the rim 62 of the cover 60 and
the flange 30. The third sealing member 80 may further include a raised
portion 82 formed to extend away from the flange 30 and between at least
a portion of the cover 60 and the conduit plate 70. The second 44 and
third 80 sealing members cooperate to provide a seal extending
substantially around the entire length of the outer surface 38 of the
flange 30. The conduit plate 70 includes at least one opening 74 for
electrical wiring for power and control connections to the converter 20.
Optionally, each opening 74 includes a "knockout" such that unused
openings 74 remain covered. The knockout being a portion of the conduit
plate 70 that is at least partially cut, punched, or otherwise configured
such that the material covers but may readily be removed from the
interior of the opening 74.

[0037]In operation, the mounting assembly 10 may be used to connect the
converter 20 to the mounting surface 25, for example an industrial
enclosure 15, while retaining a first desired level of protection, for
example a NEMA 4/4X rating. Preferably, the flange 30 is first connected
to the mounting surface 25, but optionally, the flange 30 may be
connected to the converter 20 first. At least one first fastener, such as
a screw, may be used to connect the flange 30 to the mounting surface 25
from within the enclosure 15. A sealing member 40, such as an o-ring, may
be positioned around the base 24 of the converter 20. Optionally, the
o-ring may be positioned around the mating surface 34 of the flange 30.
The base 24 of the converter 20 is inserted through the opening 32 in the
flange 30 and, if the flange 30 is connected to the enclosure 15, through
the opening 22 in the enclosure 15. At least one second fastening member
50 connects the converter 20 to the flange 30. The sealing member 40 is
thereby secured between the mating surface 34 and a lip 28 of the
converter 20 providing a sealed interface between the converter 20 and
the enclosure 15 that meets the requirements for the first desired level
of protection.

[0038]Optionally, the mounting assembly 10 may be used to connect the
converter 20 to the mounting surface 25, for example an industrial
enclosure 15, while retaining a second desired level of protection, for
example a NEMA 12 rating. Preferably, the converter 20 is connected to
the flange 30 in the same manner as described above for the first desired
level of protection. A second 44 and a third 80 sealing member may
additionally be positioned generally around the front surface 38 of the
flange 30. The conduit plate 70 may then be positioned above the third
sealing member 80. A cover 60 is placed over the converter 20 such that
the rim 62 of the cover 60 is positioned above the second sealing member
44 and that the conduit plate 70 fits within the opening 64 of the cover
60. The cover 60 is secured to the flange 30 by a fastening means such as
a threaded fastener engaging a threaded portion of each hole 66 in the
cover 60 or each of the corresponding openings 37 in the flange 30.

[0039]It should be understood that the invention is not limited in its
application to the details of construction and arrangements of the
components set forth herein. The invention is capable of other
embodiments and of being practiced or carried out in various ways.
Variations and modifications of the foregoing are within the scope of the
present invention. It also being understood that the invention disclosed
and defined herein extends to all alternative combinations of two or more
of the individual features mentioned or evident from the text and/or
drawings. All of these different combinations constitute various
alternative aspects of the present invention. The embodiments described
herein explain the best modes known for practicing the invention and will
enable others skilled in the art to utilize the invention